Help with Nextbook tablet and WIFI home computer

I purchased 2 nextbook 7p tablets for my daughters for christmas. I tried having everything set up for them before I wrapped it. Well needless to say I am still at it for 3 days. I have been reading threads and I find several people having trouble also. During the trial and error process I have also screwed up my linksys router settings and could really use some help with this if someone would be so kind to help me through this nightmare.